[Dev-C++] Static Members from Template Classes of Template Classes already compiles.

[<jul...@er...>]

The code:
********************HeaderTemplateClasses.hpp
BEGIN**************************
template<unsigned n> class Class_A{
private:
	template<unsigned m> struct Class_B{
		unsigned	A[m];
		Class_B(void){for(unsigned I=0;I<m;I++) A[I]=I;}
	};
	static const Class_B<n> StDt;
public:
	static unsigned GNum(unsigned index);
};
template<unsigned l>
unsigned Class_A<l>::GNum(unsigned i){
	if(i < l)return StDt.A[i];
	else return 0;}
template<unsigned p>
const Class_A<p>::Class_B<p> Class_A<p>::StDt;
********************HeaderTemplateClasses.hpp
END**************************
********************HeaderTemplateClasses.cpp
BEGIN**************************
#include "HeaderTemplateClasses.hpp"
********************HeaderTemplateClasses.cpp
END**************************
********************MAIN_FILE.cpp    BEGIN**************************
#include <iostream>
#include <cstdlib>
#include "HeaderTemplateClasses.hpp"
using namespace std;
int main(void)
{
    unsigned index=0;
    do
    {	cout << "Dame el indice que quieres conocer :  ";
    	cin >> index;
   	cout << Class_A<3>::GNum(index) << "  "
    	     << Class_A<5>::GNum(index) << "  "
    	     << Class_A<7>::GNum(index) << endl;
    }while(index!=11 && cin);
  return 0;
}
********************MAIN_FILE.cpp    END**************************
It is a copy&paste from the project for console in Dev-C++ 5 with MinGW
2.95.7 special.

Are there any sugestions to make better the code or are there any problem in
the code?.

Thanks.
Julián